This paper provides information on the status and distribution of 51 species of birds and two hybrids in Mexico' s Yucatan Peninsula. Of these, 20 are year-round tropical residents, two are intra-tropical migratory species (summer residents in Mexico), and 26 are Nearctic–Neotropical migrants; a Eurasian shore-bird and two vagrant gull species are also included. These records extend the distributional ranges of many species, confirm species' presences in areas where their occurrence was poorly understood, confirm the breeding activity of two species, Jabiru (Jabiru mycteria) and Piratic Flycatcher (Legatus leucophaius), in the northern part of Mexico's Yucatan Peninsula, and contribute information for determining the relative abundance and seasonal occurrence of many species. Some of this information has been presented in abbreviated form in North American Birds (in the regional report for Mexico), but detailed documentation has not been previously published, though some supporting material has been available on personal websites. Several factors have contributed to increased detection of bird species in the Yucatan Peninsula: intensive point-counts and surveys conducted during migration periods; large-scale projects involving mist-netting and acoustic recording across a broad range of vegetation types; expansion of scientific research and birding activities into areas previously visited infrequently; and the promotion of birding tourism and training of bird guides in the region.